Blade for the wheels of rotary fluid-compressors.



A. -HUGAILNINI BLADE PORTER WHEELS 0F ROTARY FLUID GOMPRESSORS.

,APPLICATION FILED SEPT. 7, 1910.

1,059,l 61., Patented Apr.15,1913.

ooLUIllA PMNOGRAPH 1:0.,WASMINOTON. Il. c.

ALBERT HUGUENIN, OF ZURICH, SWITZERLAND.

BLADE FOR THE WHEELS OF ROTARY FLUID-COMPRESSORS.

Specification of Letters Patent.

Patented Apr. 15, 1913.

Application led September 7, 1910. Serial No. 580,915.

To all whom, t may concern:

Be it known that I, ALBERT HUGUENIN, a citizen of the Republic ofSwitzerland, and whose post-office address is 139 leinbergst-rasse,Zurich, Switzerland, have invented certain new and useful ImprovedBlades for the `Wheels of Rotary Fluid-Compressors, of which thefollowing is a specication.

In the rotor wheels of rotary compressors and the like which run at avery high pe ripheral speed, suitable blades of sheet metal are employedin known manner, which project a considerable distance from the boss ofthe wheel to which they are attached, and which have a U or Z shapedcrosssection for the purpose of stiffening and fastening. Sucli anarrangement of blades is disclosed in my previous application, Ser. No.513,109, filed August- 16, 1909 (Patent No. 1,036,627). This form ofcross-section, however, possesses the drawback that it is diiiicult tot-rue up the same so that the blades work with sufficient accuracy inthe fixed casing. This truing up must be very carefully done, becausewhen the clearance between t-he casing and the blades becomes too large,the etliciency of the wheel falls off considerably, and when theclearance is too little, there is great danger of scraping of therotating blades on the casing walls.

The present invent-ion consists in providing the U and Z cross sectionof the blades with edges projecting at right angles or other suitableangle to the plane of rotation of the blades. This edge permits an easyand accurate truing up, so that the trued up blades can run safely withthe de` sii-ed clearance from the profile of the casing.

The accompanying drawing illustrates the method of carrying out theinvention.

Figure 1 illustrates in cross section a portion of a rotor wheel for acompressor, having blades formed according to the invention. Fig. 2 is aside view of Fig. 1. Fig. 3 shows in section through the line I-I ofFigs. l and 2, a development of three blades of U cross section. Fig. 4shows a similar view with blades of Z cross section.

The blades S are fixed to the boss N by means of rivets, and have anessentially U- shaped cross-section a c (l. (See Fig According to thisinvention the blades are provided for the greatest part of their radialheightwith edges a-e and oZ-f. These edges give the shanks aand c--cl anenhanced resistance to vibration. More particularly, however, theyenable the blades to be easily and accurately trued up to have all anaxial measurement m-y. If these edges were not present and assuming theShanks a-b and c-cZ to be as wide as w-y, then truing up would have tobe done to the whole length a-Z) and c-d. This would render the shanksso thin that their strength would be seriously impaired. Moreover, sucha truing up of the whole surface @Lwwould take considerable time and bemuch more diiiicult to carry out than merely truing up the thin edgesa-e and cZ-f. These truing edges can obviously be applied to Z- shapedcross-section, as illustrated in Fig. 4.

lVhat I do claim as my invention, and desire to secure by Letters Patentof the United States, is

1. A blade for rotary wheels of compressors, the body of which iscomposed of a central or intermediate portion transverse to the plane ofrotation of the wheel, and side portions 4parallel to the plane of rotation of the wheel bounding the central portion, the free edges of saidside portions being bounded by iianges, integral with, and bentoutwardly at'right angles to, said side portions, substantially as andfor the purposes hereinbefore set forth.

2. A blade for rotary wlheels of compressors having a body of U-shape incross section, the central portion of the U being transverse to theplane of rotation of the wheel, and the leg of side portions of the Ublade being bounded along their free ends or edges by outwardly bentflanges integral with, and at right angles t-o, said side portions,substantially as and for the purposes hereinbefore set forth.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ALBERT I-IUGUENIN. Witnesses:

H. KLAUSEY, CARL GHUBLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

- Washington, I). C.

